Add singleton-bool
Add singleton-bool

lwm/stackage,michalkonecny/stackage,soenkehahn/stackage,clinty/stackage,wereHamster/stackage,judah/stackage,mgajda/stackage,GregorySchwartz/stackage,alanz/stackage,jaspervdj/stackage,athanclark/stackage,stackbuilders/stackage,creichert/stackage,christiaanb/stackage,fpco/stackage,massysett/stackage,Shimuuar/stackage,ethercrow/stackage,Daniel-Diaz/stackage,l29ah/stackage,DanielG/stackage,peti/stackage,jonschoning/stackage,phaazon/stackage,simonmichael/stackage,asr/stackage,iand675/stackage,garetxe/stackage,brendanhay/stackage,int-index/stackage,k0ral/stackage,fimad/stackage,phadej/stackage,mrkkrp/stackage,spencerjanssen/stackage,mstksg/stackage,ygale/stackage